#include <stdio.h>

int main()
{
    FILE* fp = fopen("./log.txt", "w");
    if(fp == NULL)
    {
        perror("fopen");
        return 1;
    }

    //文件操作
    const char* str = "hello file\n";
    fputs(str, fp);
    
    fclose(fp);

    return 0;
}
